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TI-2026-40940 Aliases CVE-2026-56776GHSA-xhqv-vmw5-79pm

n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint

Priority LOW 24CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/{workflowId}/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a workflow can trigger a real evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00276 20th percentileScored 2026-11-07
Fix Fixed n8n (n8n): 1.123.55, 2.26.2, 2.25.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8nbefore 1.123.551.123.55Patch availableCNA
n8nn8n2.26.0 to before 2.26.22.26.2Patch availableCNA
n8nn8n2.0.0-rc.0 to before 2.25.72.25.7Patch availableCNA
  • n8n Vendorn8n Affected before 1.123.55 Fixed in 1.123.55 Patch available CNA
  • n8n Vendorn8n Affected 2.26.0 to before 2.26.2 Fixed in 2.26.2 Patch available CNA
  • n8n Vendorn8n Affected 2.0.0-rc.0 to before 2.25.7 Fixed in 2.25.7 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 1.123.55; 2.0.0 to before 2.25.7; 2.26.0 to before 2.26.2Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 1.123.55; 2.0.0 to before 2.25.7; 2.26.0 to before 2.26.2 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n) Fixed in 1.123.55
  • Fix · CNA n8n (n8n) Fixed in 2.26.2
  • Fix · CNA n8n (n8n) Fixed in 2.25.7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    n8n 2.25.7, 2.26.2

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-40942 n8n - Authorization Bypass in Public API Execution Retry EndpointPriority LOW 24
    • TI-2026-40939 n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs EndpointsPriority LOW 24
    Show all 3 records →
  • Release ·

    n8n 1.123.55

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-40939 n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs EndpointsPriority LOW 24
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56776
  2. 2026-10-03 Alias added: GHSA-xhqv-vmw5-79pm
  3. 2026-10-29 Affected versions changed · CNA

References

Advisory 1

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
  • TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences